function popupWindow(url, windowName, width, height, hasScrollbars) {
	var opts = "directories=no,location=no,menubar=no,resizable=yes,scrollbars=" + (hasScrollbars?"yes":"no") +",toolbar=no,status=no,width=" + width + ",height=" + height;
	popup = window.open(url, windowName, opts);
	popup.focus();
}

function showImage(url) {
	popupWindow(url, 'imageWindow', 990, 800, 'yes');
}